FORTSCH, V. O. DAS VERHALTEN VON BLATTFEDERSEISMOGRAPHEN BEI FREIER UND ERZWUNGENER SCHWINGUNG. Annals of Geophysics, [S. l.], v. 5, n. 3, p. 321–356, 1952. DOI: 10.4401/ag-5848. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/5848. Acesso em: 26 apr. 2024.